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We studied sediment cores from four Florida (USA) lakes that have received groundwater hydrologic supplements (augmentation) for >30 years to maintain lake stage. Top samples (0–4 cm) from sediment cores taken in Lakes Charles, Saddleback, Little Hobbs, and Crystal had 226Ra activities of 44.9, 17.5, 7.6, and 8.5 dpm g−1, respectively, about an order of magnitude greater than values in deeper,...
Gamma spectroscopy was used to measure radioisotope (210Pb, 226Ra, 137Cs) activities in sediment cores from 20 lakes and a wetland in Florida, USA. Nine profiles display relatively low (<5 dpm g−1) and constant 226Ra activities, whereas 12 show high (>5 dpm g−1) and variable 226Ra activities. In the latter group, most display up-core increases in activity. Upper sediments from two lakes (Round...
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